A Level 24 Duskull, a Level 26 Mismagius and a Level 24 Haunter.
POKEMON PLATINUM stupid!
Fantina
if you are playing platinum she is inside
it is freakin fantina... duuuuuuuuuh!
fly
in platinum she is in the Pokemon contest center
hm defog
Go east to Solaceon Town.
you have to either steal one from fantina or trade haunter
Fantina is a Ghost type gym leader, meaning normal and fighting types won't have any effect.
beat Fantina in the hearthome city gym
A trainer in Victory Road has a Gengar.